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PV Systems Math — Sample Calculations

Looking at the PV array in a PV system, many installers and inspectors are confused by new system voltage calculations that may be required...

Life Started with the Sun and Life Will Continue with the...

Our energy-intensive society has developed over the last 150 years using readily available fossil fuels that came from decayed plant matter produced through the...

Solar PV Wiring Methods — Lessons Learned from the Test of...

During an electrical inspection, it can be easy for an authority having jurisdiction (AHJ) to identify a problem or area of further examination if...

Aging Gracefully: Best practices for long life PV installations

For many years, photovoltaic (PV) plants were designed to a 20-year system life based on the length of PV module warranties. It was generally...

PV Installations for the 2020 NEC

Let’s take a look at some of the more significant changes impacting photovoltaic (PV) installations once the 2020 National Electrical Code (NEC) is validated...

The process of investigation after an inspected rooftop PV system catches...

A fire occurred on the roof of a house that had a photovoltaic (PV) system installed on that roof and the PV system was...

Meeting Local & National Codes for Solar Installations: New Guide...

The popular and frequently referenced Model Inspection Checklist for Rooftop PV is now updated and expanded to include the latest national and international codes...

Overcurrent Protection and Disco Oddities

The two previous articles in this series covered how currents are developed and handled in PV systems and how the ampacity of conductors is...

Dealing with Currents in PV Systems — Just a little more...

In the previous article in this series, we saw how the voltages from PV modules are affected by the environment and how the National...
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